Прочитайте текст и определите какой из заголовков соответствует тексту. Density specific weight is t...: ответ на тест 911474 - Английский язык

Прочитайте текст и определите, какой из заголовков соответствует тексту.
Density (specific weight) is the amount of mass in a unit volume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/m3 but most materials have a higher density and sink in water. Aluminium alloys, with typical densities around 2800 kg/m3 are considerably less dense than steels, which have typical densities around 7800 kg/m3. Density is important in any application where the material must not be heavy.